Industrial thermometer



Sept. 2, 1952 P. F. K. ERBGUTH INDUSTRIAL THERMOMETER 5 Sheets-Sheet 1 Filed Nov. 5, 1950 8 l 5/ 6|'. 2 z/v 6 l. 2 R. Wm ,\3 mm M w v um aan I 6 GV T 2 BN l 6|!! 8 6 7 RI 2.3 2 Y w E 7 E Y e z L AUA l A90- P W .Id ,6 8 i 4 'Il C 3 n IIb 5 29 n 4 5 n 3- 9 5 2 7 0 0 7 B f 3/ d .d ,N 4, 3, um l||| IJIHNWMqlm/lll/nfllnvl l l l I l l l ll 'WHWHHHJI Il I mm- H j /9 Il l IIVIIIIIHIHIIHM l I I l I I l l l I I I Il .Thlllll /ll Illll I llfl f .Q w

Sept. 2, 1952 P. F. K. ERBGUTH 2,608,863'

l INDUSTRIAL THERMOMETER Filed Nov. s, 195o s sheets-sheet z PAUL EK. ERBGUTH @lL/ INVENToR.

75L Ma-@ A 7' TORNE YS Sept' 2, 1952 P. F. K. ERBGUTH 2,608,863

INDUSTRIAL THERMOMETER 5 ShetS'hS-heet 3 Filed Nov. 3, 195o PAUL E K. ERBGUTH INVENTOR.

Y 454m M -A RNEYS Sept. 2, 1952 P. F. K. ERBGUTH 2,608,853

INDUSTRIAL THERMOMETER Filed Nov. 3, 1950 5 Sheets-Sheet 4 PAULEK. ERBGUTH s INVENTOR.

'f w y A omvfys Patented Sept. 2, 1952 vUNITE-D STATES PATENT '-O'F F ICE 2,608,863 n 7 Y INDUSTRIAL THERMOMETER 'Paul F. K. Erbguth, lGreat Neck, N. Y., assigner to Weston Electrical Instrument Corporation,

, Newark, N. -J a corporation of New Jersey .I j Appieaiien November 3, 195o, serial No. 193,863

1 This invention relates to improvements in 'thermometers and more particularly to Aa novel construction 'of 'the thermometer case 'including lsimple Vmeans for resilient-ly supporting 'the scale plateA and for removably 'mounting ythe trans'- parent cover plate.

Glass thermometers designed yfor industry use are provided withmetall'ic protectivelcases having Claims. (Cl. v'7S-375) plete is supported resilient-.1y arid aqi-iisiabiy 'oye 'a transparent glass, or plastiaront and are gen- 'eralli7 known as industrial thermometers Nu"- inercus problems are associated with such industrial thermometers. It is,'"ol course, necessary that vthe readable portion of 'the 'instrument vbe l'e'xposed'to full, open 'view 'regardless of the direce Ivtion or angle at which the temperature-sensitive Ae'nd of the unit protrude-s from the apparatus within which temperature readings are to be taken. 'This 'requirement necessitates the use of various 'special fittings which, turn, require, nu-

hieraus different-types of case designs. In fact,

swivel joints are often used v'for thisp'urpose. In accordance with my invention, a single case design 'is made tot'a full complment f such 'special fittings resulting manufacturing economy.

'Present industrial thermometers are of rather complicated construction that the scale plate must be adjustable with respect to the glass thermometer morder to establish accuracy of indications, and the transparent c'o'vei plate `must bze removable to permit such adjustment in the factory and to aiiord quick 'and easy removal of the plate for cleaning purpo'ses and 'replacement of such plate inthe 'event of breakage.Y In these respects, a thermometer made in accordance with invention results a device which is simple to assemble and which employs `a minimummcf 'fastening means such as sc'rews, bolts, etc. The cover glass may lbe install'edpand removed without disassembling `any part of the case and without the use of tools.

An object of 'this invention is the provision of an industrial thermometer herein the protective case 'is of simple construction and of universal application to ttings of special character.

An object oi Athis invention is the provision of an industrial thermometer having' novel means for reinovablvv mounting thev transparent vcover plate. Y j o An object of this invention is the provision of an industrial thermometer case having novel means for adjustably and resiliently'supporting a scale plate.

An object of this inventionls the provision of an industrial thermometer case in which the means resliently supporting the scale plate is iixed in position within the case without the use of additional fastening means.

An object of this invention is the provision of industrial thermometer case wherein the scale member that is retained Aspring clips.

An object 'of vthis 'invention the provision 0f an industrial thermometer wherein the 'trainsparent cover plate {is supported fin position by a resilient member 'disposed longitudinally' Within the case and spring' lip's disposed transversely Within said case. o

An object of this 'invention is the provision of an industrialvthermometer comprisingfa case, a fitting attached to one vend of the case, a glass thermometer extending from the fitting into the case, a resilient member disposed within the'case, said member including diverging sides spa'cd'on eachside of the thermometer, traiisv'erselifedisposed spring clips within the case, said clips retaining the vresilient 'member iii' relatively fixed position within the case, a scale Yplate-a djustefoly 'posi-tion by removable secured to each of the diverging sideso'fi'the-said resilient member, and' a transparent coverfplate removably disposed between the" resilient member, the spring clips and the front of the case.

These and other objects 'and advantages kwill be apparent from the following description when taken with the accompanying drawings. f The drawings are` for purposes 'of illustration arid are not to be `construedas defining the scope or limits of the invention, reference being had for the latter purpose to the appended claims.

In the `drawings wherein like reference 'cl'i'aracters denote like. parts in the several views:

Figure 1' 'is a front viewl of the 'thermometer case; u

Figure 2 is a transverse, sectional view'taken along die une A-v-A of Figure 1; i

Figure 3 is an yelevation of thev lowerv end oi the case; f

Figure 4 is aiplan View showing a sheet'oi metal from which the resilient, scale plate-'supporting member is formed; e

Figure 5 'is a plan view showing the completed scale plate-'supporting member;

Figure 6 is an end view of the member shown in Figure 5;

Figure 7 is a side view of such member;

Figure 8 is an isometric view of one of the spring clips;

Figure 9 is a plan view of the thermometer case with the resilient scale plate-supporting member in place and showing this memberretained in relatively fixed position by Vclips of the type shown in Figure 8;

Figure 10 is a transverse, sectiona-lview taken along the line B--B ofKFigure `9 but drawn to an enlarged scale f Figure 11 is a plan 'View' of the two lscale plates;

Figure 12 is an .end View of rsuch Scale plates; l

Figure 13 is unit;

Figure Mis a partial assembly, in plan, show` 'an isometric. view of a locking ing one scale plate mounted on the resilient supporting member;

Figure is across-sectional view .taken along the line C-C of Figure 14;

Figure 16 is a fragmentary, plan view of the thermometer case showing the arrangement for holding the glass thermometer within the case;

Figure 17 is an isometric view showing the two spring clips which, when vassembled together, form the arrangement for holding the thermometer in the case; l

Figure 18 is an end view showing these two clips assembled together;

Figure 19 is a fragmentary, plan view, showing the upper part of the thermometer case with a slidable plate in place thereon;

Figure 20 is an isometric -view showing a leaf spring having a stud secured thereto;

Figure 21 is a cross-sectional view taken along the line D-D of Figure 2D;

Figure 22 is an isometric view showing the constructionof the slidable plate;

Figure 23 is similar to` Figure 19, with the slidable plate removed and the case broken away, to show the studs which support the assembly of the parts shown in Figures 20 and 22 whereby the slidable plate operates as shown in Figure 19;

Figure 24 is a cross-sectional view taken along the line E-E of Figure 19 showing the assembly of these parts;

Figure v25 is a front view of the complete industrial thermometer, with 'parts broken away, 'showing the case and a straight-through, associatedtting; v

Figure 26 is a fragmentary, isometric view of the case and showing the various holes for accommodation of the glass thermometer, the screws for mounting the fitting and the locating pms; Y

Figure 2'? is an isometric View of the straightthrough fitting showing the'locating pins and holes adapted for cooperation with the holes in the case end;

Figure 28 is a front View of such tting;

AFigure 29 is a plan view of the thermometer case with the transparent cover glass in place;

Figure 30 is a transverse, sectional view taken along the line F--F of Figure 29, and drawn to an enlarged scale;

Figure 31 is a similar Yto Figure 29 but showing the slidable plate moved to a position preparatory to removal of the cover glass;

Figure 32 is a cross-sectional view similar to Figure 30, and showing the cover glass moved to one side of the case for pivotal removal; and

Figure 33 is an isometric view showing the cover glass in tilted position with respect to the case.

Referring now to Figures 1-3, the thermometer case III is made, principally, from a single sheet of Vmetal formed into the appropriate channel or cross-sectional configuration comprising the flat base section II, the inclined bottom sections I2, the parallel sides I3 and the inwardly-bent edges I4. 'I'he case is completed by an upper end I5, comprising a solid piece of metal, and a lower end I6 provided with a central hole Il', two threaded holes I8 and two relatively small holes I9, as shown in Figure 3. The purpose of the holes will be described in detail hereinbelow. The lower end IE includes a section 2B that is integral therewith and extending at a right angle thereto to fit between the inwardlybent edges I4 of the case proper, as shown in Figure 1. It may here be pointed out that the end pieces I5 and I6 are soldered, brazed or welded into place to form a sturdy case. Insuch construction theV body of the case' is of uniform, cross-sectional configuration throughout its length and, consequently, such body portion may be made of any desired length to accommodate a particular glass thermometer. Such body portion may be formed from a strip of sheet metal, extrusion molding or other conventional methods, aiording ylow production cost, accuracy and a high quality, smooth surface iinish, both inside and out, without special machining. The end members I5 and I6 are each of standard construction regardless oif-'the length of the body member and the holes in the lower end I6 are designed to accommodate a variety of straightthrough vor angular fittings whereby the case is of universal application to provide a complete, industrial thermometer.

The base section II, of the case, is provided with two transverse recesses 22 which may be formed by almilling operation. These recesses, together with a pair of spring clips, serve `to locate and securea resilient member designed to carry the scale plates and to retain the cover glass in position, as will now be described.

Figure 4 illustrates a flat sheet of metal punched to provide the opposedv notches 25, 25', the aligned, elongated apertures 26, 26' and the elongated apertures 21, 21. The metal sheet is bent longitudinally along theA broken lines a, b, c, andl d, resulting in the configuration shown inthe plan View of Figure Sia-nd the end View of Figure 6. It will be noted that the bends formed along the broken lines b and c bisect the aperturesZG, 26', respectively. In view of the removal of some ofy the metal along these lines b and c, a downward pressure applied to the wing portions 28, 28', as along the arrows e, e, shown in Figure 6,` will result in a flexing of the structure about such bends rather than the solid bends a and d. This feature is of practical importance in the completed device, as will be explained hereinbelow with specic reference to Figure 30. In its completed form the resilient member (Figure 6) comprises a trough formed by central 4base portion 30 and the substantially parallel sidewalls 3|, 3|', and a pair of divergently-extending wing portions 28, 28. The ends 32 of the base portion 3!)A are oiset slightly,.as shown more clearly in the side view of Figure 7, and the notches 25, 25' provide a means for accommodating spring clips by which the entire resilient member is secured in position within the case.

Figure 8 is an isometric View of a spring clip 35 formed of a single piece of suitable spring material such as Phosphor bronze, beryllium copper or the like.- The shape ofthe spring clip conformsto the transverse or cross-sectional conguration of the case. However, in the normal state, the side walls 36 of the spring clip diverge outwardly such that the linear distance between the ends thereof is somewhat greater than internal distance vbetween the side walls of the case. Consequently, when the spring 35 is inserted into the case it will be held in place by its own spring tension exerted against the side walls of the case together with the matching multi-planar conguration of the spring clip. and the bottom of the case, as shown in Figure 9. Additionally, the spring clip includes the turned over ends 3l which abut against theinner surface of the case edges I4. It will be apparent that when the acca-sos it is subject only 'to sliding movement longitudinally of the case.

Two spring clips, ofthe type shown .in Figure "8, areY employed to anchorthe resilient jmem'ber (Figure') withinthecase.' The spring 'clips 'are inserted, one at each end of the case, andthe resilient member, identified byj'the numeral 40,is inserted into the case yso that Athe offset 'ends 3.2 fallwithin the transverse recesses 22` (see Figure`1). Each of the spring clips is then slid toward the resilient member until it abuts against theend thereof within `the clearance provided by the notches 25 '25.5 (see Figure'l). In such K positionas` shown by the 'lower spring clip Figure 9,]the spring clip overlies the end portion of the base 3D of .the resilient member. The upper spring clip is likewise moved into the overlying position whereby the resilient member is firmly and securely locked in position with respect to the case.. The relative disposition of the parts, in the assembly thus far described, is shown in the enlarged cross-sectional view of Figure 10. taken along the .line B-B of 'Figure 49'.

As stated, above, one function of theresilient member 40 is to support the scale plate of the instrument. In accordance with conventional practice. the scale plate consists o f two parts 45, 45', as shown in Figure '11. These parts 'include complementary scale graduations and y when mounted in the instrument there is presented the appearance of a single scale plate with .graduations extending to either side of the .glassthermometer. Each `scale plate includes acircular hole 45, 4B located for minimum'interference with the scale graduations vand numerals, and each scale plate is given a 'contour as shown in the end view of Figure 12. Specifically, the central portion 48, 48' of each scale plate member is ilat, the outer Aedge 49, (49') is oiset with respect thereto, and the inner edge 50, (50') is formed in a reverse bend. As shown in Figure 14, the scale plate 4'5is adjustably attached to thawing portion of the resilient vmember 40 by a screw 5l 'passing through the hole` 46 rin the scaleplate and into threaded engagement with a nut disposed under the'scaleplate. The nut 52 employed for this purpose isiof the stamped variety as shown in Figure 13. Suchnutsare well known and include a clearance hole 53 in 'one face and a pair of punched, 'bowed lingers. in the other face. said Yfingers arranged to provide a self-gripping action on a screw threaded therebetween. As shown in the right hand portion of the Figure 14 assembly, the nut 52 is lslidably mounted over the edge of the wing member 28' of the resilient member and whenthe scale platefastening screw is threaded into such nut the scale plate and nut may be moved, slidably, within a range dened by theielongated aperture 27'.v In prior constructions adjustment of the rscale plate position is accomplished by'providing'an. elongated aperture in the scale plate which results in a displacement of the scale-plate relative to the fastening screw. In such priorjconstruction the result is not particularly pleasinggfthe. elongated aperture or slot interferes with the placement vof the ynumerals and disrupts the uniformity of the graduations. More importantly, after relatively few adjustments of the scaleplateA the surface thereof becomes marred by the screw head. In my construction, thev screw .and scale platefmove as a unit, during the mechanical positioningvor adjustment of the scale plate and, consequently, the surface quality of the scale plate is not ruined v6k and, additionally, there are no restrictions placed upon the extent of the scale graduationsv 'or the location of relatively large numerals. Still 'further, the described construction facilitates 'the assembly operation "as itis a simple 'matter to align the 'hole 1'in thel scaleplate with 'the hole inthe nutl'for insertionof 'the lfastening screw.

Figure 15 lis 'a cross-sectional.viewjtaken along the ln'e 'C-j'C 'of the partial assembly shown in Figure 14. It will be noted that the center portion 48'cf 'the scale plate "conforms to the width of the wing section 28l andl lies substantially `flush thereon as the nut j52rls made of, relativelythin material. .Such deslgnprevents 'rotation ofthe scale plate memberrabout an axis formed .bythe single mounting'screw. @The offset end sectionA 4S of. `the scale plate lies .in a ,plane substantially parallel to that of 'thebase portion 3B of the resilient member, while the inner-reversebend 59 of the scale plate slopes toward the median lline of `such 'base portion '30. .'It 'will be now apparent that when the two scale plate members are assembled on the resilient member, such scale plates come fairly close together V at thebase section 3'0, vand the oiset side portions 49 (49') of the scale plates provide relatively .flat surfaces for the support `of a cover. glass. ,In the' actual assembly of the device.,l the resilient member 34B .'is'fi-lrst secured within fthe case bythe; spring clips., after which thetwo s'caleiplate members are attached as 'just described. Y, .y

'Ihe arrangement `for supportingga glass stem thermometer within the .case willnow be described.. In'Figure 17 there are shown a spring Y clip 55 anda more or less conventional fuse clip ,56.` The clip 55 is somewhat .similar to the spring clip. 35 (seeFigure 8) and includes the lparallel apertures 51 in the base portion thereof. The side arms of the fuse clip 56 are passed through these apertures to form the Vassembly shown in Figure 18 and the latter. is inserted within the case lll at theupper end'thereof, as shown in the fragmentary plan -view of-Figure 16. The upper portion of the thermometerjisdisposed within the resilient side arms of the fuse clip. as shown .in Figure 25.

Referenceis now made' to ,Figure 19 which is a fragmentary, plan View. showing .the upper portion of the thermometer case. Sliolably disposed bctween thesides-M of "the case Illv is a flat plate 60, the purpose of whichis to facilitate insertion and removal of `the transparent cover glass, as will be describedin detail hereinbelow. The limits of the slidable movement ofvr this plate are shown by the solid anddotted line positions thereof. Such movement of the plate may be accomplished without fear of the plate becoming disassembled from `the case by reason of a novel construction .nowvto be described.

Figure 20 illustrates a leaf spring 650i arcuate shape and having a. rivet-,66 rigidly secured to thecenter thereof. The formation of the rivet is better shown in Figure 211 which is a crosssectional View taken along thelineD-D of Figure 20 and drawn to an enlarged scale. Each end of the leaf spring includes a'notch 61 designed yto t over the shouldersg of the pins 69 that are soldered, welded, or otherwise secured to the endV l5 of the case,- as shown in the fragmentary view of Figure-23. It will be noted the pins 63 extend along the side walls of the case and lie under,v butl slightly spaced from, the turned-over case f sides 14.; The construction of the slidable platev 60 is" shown 'ini Figure 22 and includes a backing plate H'having a transverse,

7 elongated aperture I2 therein,and a pair o f ears 'I3 that are bent slightly fromthe. plane f of the backing plate. These two platesthe upper plate 60 and the backing plate 'II are. intimatelysecured together as by soldering;Welding-creto., to forma unitary structure. Alternatively, such structure can begcast ras `a single unit. ,In assembling the slidable p lategiarrangem'ent, the leaf spring 65 isinsertedj-under the case sides I4 .with the notches'l of :the springdisposed. over the shoulders B8 ofthe pins 69. In this position the center of the leaf spring .andl the Vrivet 66 extend .slightly beyond the, connes (off the case proper. The unitary stru'cizture ofFigure22 is then placed over theleaffgspringjsuch that the rivet 66 lies infthe elongatedaperture 'I2 ofthe backingplate.; By applying, a -combined tilting motion to the plate 6B, ina.` direction along the longitudinal axis of the case,.and a simultaneous rotary motion, first onevand then the other of the ears 'I3can be forced under the associated case sides I4, A while still retaining .the rivet l66 within the aperture 12,. A clear understanding of this assembly may bejh'ad from Figure 24v Which is a cross-section view taken alongvth'e line of Figure 19. It will be clear thatI the endspf the leaf spring B rest upon the shank'rportions' of the pins 69, to either side ofthevfshoulders 68, and that the leaf spring results'in a constant 'upward pressure exerted by the ears 13 againsztthe bent-over case sides I4. Such pressurefis suicient to retain the plate60 in position v'yet affords ready, slidable movement of the platelo ng itud inally of the case,wthin .the limits defined, by

the elongated aperturejIZ and the coacting Figure 25 illustrates a complete industrial'thermometer with the transparentv cover glass removed and with certain parts broken awayA for purposes of description. One end of the case Il! has a straight-through type of 1fitting `lll) secured thereto, the latter carrying acoupling nut 8i that is freely rotatable on thesteirr of, 'the' connecting piece 83. The coupling` nut permits attachment of the thermometer, byfnieansof a ,union or a separable socket connection, to' a piece of apparatus, as is standard practice in this art. A thin-walled bulb chamber `84 is secured to the connecting piece B3 by a left handed thread to prevent Vthe chamber from loosening if the case is turned in removing the thermometer from the socket. It is also standard practice to provide an asbestos packing 85, uniformly compressed around the enlargement 86 on the stem of the glass thermometer 8l, to ,prevent 'movement of the thermometer relative to the scale plate. To promote rapidnheat transfer, the space between the thermometer and the thin-walled bulb chamber 84 may be filled with mercury, graphite or other good heating conductingy medium. As already mentioned, the upper l'end of the glass thermometer is securedagainst lateral displacement by the fuse clip 56.

I have already stated that a case/made in accordance with this invention is of universalapplication as it may be `attached to a variety of special fittings such as the` straight-through, right angle front or back, oblique, etc. types. As shown in Figures 27 and 28, the base of the fitting 80 is shaped to conform to the adjoining case end, shown clearly in Figure 26,` and carries the two locating pins 90 that fit into the holes I9 of the case end to assure a. proper, accurate assembly. The fitting is attached to the case by means of two screwszpassing through Ythe-mounting holes 9i into threaded engagement with the threaded holes I8 in the case, the mounting holes in the fitting being counterbored at one end for iiush mounting of the screw heads. in the fitting is adapted for alignment with the hole I'I .in the case end whereby the glass thermometer passes readily therethrough. As a practical matter, the hole 92 in the tting can be substantially larger than the hole vI'I in the case to eliminate the need for critical alignment of these holes in the assembled device. Although I have speciiically described a straight-through type of fitting it will be understood that right angle andoblique fittings can be furnished each having a base conforming to the shape of the case end and each provided with mounting holes, a thermometer hole and locating pins, located and disposed as, described with` reference to Figure 27. Consequently, any such fitting may be attached to the case conveniently, quickly and properly to produce y an industrial thermometer designed for a particular application.

The removal of Athe cover glass from the above described thermometer case will now be described. Figure 29 is a front view of the case IU with the cover glass Ill() in place and Figure 30 is a transverse, sectional View takenA along the line F-,F of Figure 29 and drawn to an enlarged scale. It will be noted that the cover .glass is disposed between the bent-over ends 3l of the spring clips 35 and rests upon the substantially-nat surface formed by the offset ends 49, 49', of the two scale plates. The glass is pressed upward, by the pressure provided by the wings 28, 2B', of the resilient member 40, against the under surface of the case sides I4 and` theoset portion 20 of the caseend. Consequently, the cover glass is held firmly, but resiliently, in place and will not rattle or shatter when mounted on machinery which has a tendency to vibrate. To remove the glass, the slidable plate 60 is moved to the position shown'in Figure 3l and by means of a gentle pressure and sliding action the glass is moved in the directionof the plate 60 so that the lower edge IUI of the cover glass clears the inner edge 20 of the case end. Inthis position the glass is held within the oaseonly by the overlying case sides I4. Finger pressure is now applied at one side` of the glass, as indicated by the arrow a, in Figure 30. AThe glass lis. pressed downward, against the spring tension of the wing 28 of the resilient member, until the edge of the glass lies belowthe end 3l of the spring clip, whereupon the glass may be moved laterally to abut against the side 36 of the spring clip, as shown in Figure 32. vWhen the finger pressure is now removed, the opposite side of the cover glass lies clear of the case side I4 and will move'outwardly of the case (as indicated by the arrow, Figure 32) in response to the spring pressure of the wing 28. It is to be noted that the free edge of the wing member 28 lies outside of the inner edge of the oase side I4. Consequently, the edge of the case side, in contact with the glass, serves as a fulcrum ,about which the cover'glass rotates in responseY to upward pressure exerted by the wing member at a point displaced from such fulcrum. As is apparent from Figure 33, the glass may now be removed by simply withdrawing samelaterally from the case.

, To mount the cover glass in position a reverse procedure is followed. Briefly, the side of the glass is inserted within one side of the case with the inner edge thereof under the bent-over end of the spring clip (Figure 32). By finger pres- A hole 92 l11 and a flat base portion Vhaving-odset ends disposed' within theA said recesses; a pair of spring clips each overlying the offset ends of the base of the resilient member, said spring clips conforming Asubstantially to the transverse vcontour of the body and terminating in offset ends diverging from the inturned sides of the said body; a transparent closure plate disposed between the offset ends of the spring clips and resiliently sustained between the inturned sides of the body and the wings of the resilient member; a slidable plate disposed between the inturned sides of the body and at one end thereof; opposed ears extending from the plate and slidable under the inturned sidesof the body; an elongated slot in the bottom of the slidable plate; a pin;

and spring means resiliently retaining the said pin in the said elongated slot.

12.` yThe invention as recited in claim 11wherein the spring means resiliently retaining the said pin in the elongated slot comprises an arcuate leaf spring having a notch at each end, and said leaf spring is supported by pin members having a shoulder disposed within the said notches.

13. The invention as recited in claim 12, wherein the pin members are spaced from the bottom of the body and are secured to one of the end plates.

14. A vthermometer case and assembly comprising a body having inturned sides forming an outer bearing for a transparent closure plate; end plates closing each end of the body; a resilient member disposed in the body, said resilient member having diverging wings joined by a central channel portion; spring clips removablyretaining the resilient member in placewithin the body, said spring clips conforming to the transverse contour of the body and terminating in offset ends diverging from the inturned sides of the body; a transparent closure plate disposed between the offset ends of the said spring clips and compressively urged against the said inturned sides of the body by spring pressure resulting from'a exing of the said wings of the resilient member; a Aslidable plate disposed between the inturned sides of the body and at one end thereof; and a pair of scale plates adjustably mounted on the said Wings, said scale plates each having an outer marginal side in' substantially iiush contact with the inner surface of the transparent closure plate and an inner` marginal side disposed within the channel portion of the resilient member.

15. A sub-assembly for industrial thermometers and comprising a resilient member having divergently-extending wing portions joined by a central channel portion, a longitudinally-extending slot in each wing portion, a nut slidably carried by each wing portion, a scale plate olisposed over each wing portion, a hole in each scale plate. a screw passing through the scale plate hole and the cooperating wing slot into threaded engagement With the associated nut, each scale plate having an inner marginal side formed in a reverse bend and lying within the said channel portion and an outer marginal side angularly offset with respect to the center section of the scale plate and lying in a common plane.

16. The invention as recited in claim 15, including apertures in the said resilient member, said apertures lying on the lines defining the base of the said channel portion.

17. In an industrial'- thennomete df the type comprising a caser havingA a: removable transparent cover plata/ threaded tting secured to an end of the case, and a glass thermometer ex= tending through the fitting into the case, the improvement comprising a base portion on'rthe fiti ting, said base portion conforming to the general configuration of theV case end; aV set of. locating pins extending from the base portion of the litting into the said locating holes, a set of holes in the case end, correspondingly-aligned holes passing through the base portionof the fitting. fastening screws passing through the holes in the fitting and threaded intothe holes inthe case end, and a central aperture in the base portion of the fitting and aligned with an aperture in the case end, said aligned apertures providing a, passageway for the glass thermometer.

18. An industrial4 thermometer comprising a case having inturned sides y forming an outer bearing for a transparent closure plate; a resilient member supported on the bottom of the case, said resilient member kl'iaving divergently-extending wing portions joined by a central channel portion; a pair of spring clips removably securing the resilient member within the case, said spring clips conforming to the transverse contour of the case and having odset ends vdiverging from the inturned sides of the case; a scale plate member adjustably mounted on ,each of the said wing portions, said scale plates leach having an offset marginal side lying in a planel substantially parallel to that of the inturned sides of the case; a transparent closure plate resiliently sustained between the inner surfaces of the said inturned sidesI of the case and the said oset marginal sides of the scale plates, saidclosure plate disposed between the offset ends of the said spring clips; a removabler tting secured to one end of the said case; alignedholes in the tting and the adjacent case end; a glass thermometer passing through such aligned.l holes and lying within the channel portion of the said resilient member; a slidable plateA disposed between and substantially flush with the inturned sides of the case; and means normally effective to limit the extent of the slidable'motion of said slidable plate. s Y

19. The invention as recited in claim 18, wherein the case end to which the removable iitting is secured has an oset side that is co-planar with the inturned sides of the case and partially overlies the transparent closure plate.

20. The invention as recited in claim 19, wherein the adjustable mounting of the scale plates on the wingl portions comprises an elongated slot in the wing portion, a nutv slidably carried by the wing portion,l a hole in the scale plate, and a screw passing through the hole in the scale plate and the slot in the wing portion into threaded engagementwithfthe nut.

'PAUL`F.}K. ERBGUTH.

REFERENCES CITED The following references areof record inthe file of this patent:

UNITED sTATES-=AfrENTs 

